GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
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BE - SEMESTER- III (New) EXAMINATION — WINTER 2019
Subject Code: 3131706 Date: 30/11/2019
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Subject Name: Measurement and Instruments
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Marks | ||
|---|---|---|
| Q.1 | (a) Demonstrate Indicating type instruments. | 03 |
| (b) Compare: Accuracy and Precision with example. | 04 | |
| (c) Explain Loading effect and its elimination in AC and DC Meters. | 07 | |
| Q.2 | (a) What is transformer? Write down types and application of transformers. | 03 |
| (b) Explain frequency measurement using Zero beat frequency meter. | 04 | |
| (c) Explain working principle of PMMC meter in detail with its neat diagram. | 07 | |
| OR | ||
| (c) Explain Digital multimeter with its block diagram. | 07 | |
| Q.3 | (a) Explain RS 232C Standards in brief | 03 |
| (b) Obtain Lissajous pattern using CRO in X-Y mode for frequency measurement of 2:1, 3:1, 3:2 & 4:1 with its procedure & Waveform. | 04 | |
| (c) Explain block diagram of CRO with function of each block in details. | 07 | |
| OR | ||
| Q.3 | (a) Identify different techniques for measurement of medium resistance. Explain any one in detail. | 03 |
| (b) Find resistance values for Ayrton shunt to provide an ammeter with current ranges of 1 A, 5 A and 10 A. A basic PMMC meter with an internal resistance of 50 Ohm and a full scale deflection current of 1 mA is to be used | 04 | |
| (c) Explain Kelvin double bridge for low resistance measurement with neat diagram | 07 | |
| Q.4 | (a) Explain Electronic Timers. | 03 |
| (b) Explain Hay’s bridge method to measure unknown Inductance. | 04 | |
| (c) Explain Schering' bridge method to measure unknown capacitance with its circuit diagram and calculations. | 07 | |
| OR | ||
| Q.4 | (a) Explain Distortion Analyzer with example. | 03 |
| (b) Explain Sweep frequency generator. | 04 | |
| (c) Explain Universal Timer-Counter with its block diagram. | 07 | |
| Q.5 | (a) Explain Conductive coupling interference with example. | 03 |
| (b) What is Inductive Interference? Explain How it can be reduced. | 04 | |
| (c) What is Current transformer? Explain its working with construction diagram. | 07 | |
| OR | ||
| Q.5 | (a) Explain Ground level interference in brief. | 03 |
| (b) Explain Power factor measurement using Analog meter. | 04 | |
| (c) Explain 3 — Phase Power measurement using 2 watt meter method with necessary diagrams. | 07 |
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